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J. Kim, P. Ryan, K. Klepeis, T. Gleeson, K. North, J. Bean, L. Davis and J. Filoon Tectonic evolution of a Paleozoic thrust fault influences the hydrogeology of a fractured rock aquifer, northeastern Appalachian foreland Geofluids 14

Version of Record online: 19 FEB 2014 | DOI: 10.1111/gfl.12076

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The Hinesburg thrust juxtaposed hanging wall metamorphic rocks with footwall sedimentary rocks along a ductile fault zone during the Ordovician and was subsequently deformed by three additional tectonic events from the Devonian to the Cretaceous. Aquifers from the hanging wall and footwall have separable groundwater geochemical signatures and low and high well yields, respectively; however, wells drilled through the thrust have groundwater with hanging-wall-dominant or weakly mixed geochemical affinities. A hydrogeologic model involving a low-K hanging wall overlying a high-K footwall, which was modified by later folds and fractures, explains these observations.

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